Claude's desktop app has three modes. Learning when to use each one is the single most important step in making AI work for your practice. Most lawyers who have tried AI tools have only experienced the equivalent of one mode — the chat interface. That's like buying a Swiss Army knife and only using the bottle opener.
Today you'll learn all three modes and when each one creates the most leverage for legal work.
Chat is the conversational interface. You talk to Claude the way you'd talk to a fast, knowledgeable associate sitting across the table.
This is where you go for:
- Analyzing a legal issue — "Walk me through the enforceability risks of this non-compete under California law"
- Brainstorming negotiation strategy — "The buyer is pushing for expanded indemnification carve-outs. What's my best counter-position?"
- Getting a first take on a contract provision — "Is this limitation of liability standard for a SaaS agreement of this size?"
- Drafting something from scratch — "Draft a demand letter addressing breach of the service-level commitments in Section 4"
You stay in control of every step. You ask, Claude responds, you refine. This is the mode most lawyers are already familiar with from ChatGPT or similar tools.
Cowork is the autonomous mode. You point Claude at a folder on your computer, give it a task, and it goes and does it. It reads files, creates new ones, edits existing documents, and makes its own decisions about how to get from A to B.
This is where you go for:
- Full contract redlines — "Review this 40-page agreement and apply tracked changes for every issue you find"
- Closing document generation — "Generate the complete set of closing documents from this term sheet"
- Research memos — "Produce a comprehensive regulatory analysis covering securities, banking, and consumer protection implications"
- Batch processing — "Review all five NDAs in this folder and produce a comparison matrix"
This is the mode most lawyers haven't tried. It's the one that will change your practice the most. Instead of going back and forth in conversation, you describe the outcome and let Claude work through the steps autonomously.
When you have a 40-page agreement that needs a full redline, or a stack of closing documents that need to be generated from a term sheet, hand it to Cowork and let it work.
Code gives Claude full terminal access. Most lawyers don't need it daily. But it unlocks capabilities that no other legal tool can match.
One practical example: a lawyer with a condition that makes it hard to read long documents used Code to build a command-line tool that converts legal documents into spoken audio. It handles the entire pipeline — parsing Word docs and PDFs, converting legal formatting like "Section 4.2(b)(iii)" into natural speech, expanding abbreviations, chunking the text, sending it to an AI voice API, and assembling the final audio file. He listens to contracts on his commute. Claude built the whole thing.
Other Code mode use cases for lawyers:
- Citation formatting — Build a tool that parses and reformats every Bluebook citation in a brief
- Document automation — Create scripts that generate customized engagement letters from a template and client data
- Data extraction — Build pipelines that pull structured data from stacks of closing documents
- Compliance monitoring — Set up automated checks against regulatory databases
Most lawyers will spend 90% of their time in Chat and Cowork. But knowing Code exists — and knowing Claude can build custom tools for your specific practice needs — is part of what makes this approach so powerful.
Here's a quick decision framework:
Use Chat when you want to think through a problem interactively — analyzing issues, brainstorming strategy, getting quick takes on provisions, or drafting with real-time feedback.
Use Cowork when you have a defined task with clear deliverables — contract redlines, document generation, research memos, batch processing. Anything where you'd normally hand a folder to an associate and say "get this done."
Use Code when you need a custom tool built — document conversion pipelines, citation formatters, data extraction scripts, or automation that doesn't exist as an off-the-shelf product.
The power comes from combining them. Use Chat to analyze the issues and decide your positions. Hand it to Cowork to produce the redline and the cover memo. Use Code to build the tools that make both processes faster over time.